No need for a DDS card for those in the Regulars/Reserves as a MOD90 (the new F1250 for those aged RAF types) works fine in the Apple Store, Yo Sushi, Costa, etc...etc...
On the ID card subject I always though that it made sense to issue a card to everyone that left with Regular Reserve commitment under RFA80 or RFA96. The expiry date of that card would be the date that the commitment to re-called back to the Service expires. That way, the individual knows when their Regular Reserve commitment ends - broadly speaking for those that retired without a pension it is 6 years and for those that did it is age 55/60 (there are many variations inbetween). As a member of that group then individuals are still de facto Reserves and should be allowed to remain Mess Members and access the Clubs/Assocs if they wish to.
LJ